I’m reading the pdf version.
The footer of almost every page has text “report erratum”. It’s a link to /titles/ehxta/explore-it/. When clicked it redirects to Explore It!: Reduce Risk and Increase Confidence with Exploratory Testing by Elisabeth Hendrickson.
It’s confusing. I was expecting a page where I can report errata, but the general book landing page opened.
I guess the link should actually point to this site, Explore It! Book Portal | Devtalk